IR@NEIST - North East Institute of Science and Technology (CSIR)
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Distribution and nature of organic/mineral bound elements in Assam coals, India
Get PDFThis study focuses on the determination and concentration of twelve elements (Na, K, Ca, Mg, Cr, Mn, Fe, Co, Ni, Cu, Zn and Cd)
occurring in sub-bituminous Assam coals and their geochemical association. Distribution of these elements between organic and mineral
matters was studied. Comparison of the results of three coals has shown that three elements (Mg, Ca and Mn) are significantly organic bound,
while five elements (Fe, Co, Ni, Cu and Zn) are significantly mineral bound; Cd is 50% bound to either organic or mineral matter. FTIR and
XRD studies reveal qualitative information about the bonding pattern and nature of components of the mineral matters. The results obtained
in this study have considerable geochemical and technological interest
Effect of leaching high sulfur sub-bituminous coal by potassium hydroxide and acid on removal of mineral matter and sulfur, Fuel
Get PDFThe effect of leaching coal samples from Boragolai and Ledo collieries of Makum coal fields, Assam, situated in north eastern region of
India with potassium hydroxide solution alone at 95 and 150 8C as well as followed by mild acid on demineralization and desulphurization
was investigated. Potassium hydroxide alone leads to 2–19% demineralization and 16–30% desulphurization of the coal samples at 95 8C.
Demineralization of the coals decreases to 1–11 and desulphurization increases to 26–43% on increasing the temperature to 150 8C. The
decrease in demineralization is due to increased precipitation of potassium aluminosilicates. Demineralization of the coal may be enhanced
to 28–45 and 39–68% and desulphurization to 22–35 and 34–53% at 95 and 150 8C, respectively, by leaching the potassium hydroxide
treated coal with 10% hydrochloric acid which decomposes the potassium aluminosilicates to certain extent. The treatment almost
completely remove the inorganic and up to 37% organic sulphur from the coal samples
A one pot efficient process for 16- dehydropregnenolone acetate
Get PDFA one-pot eco-friendly and efficient transformation of steroidal
sapogenin diosgenin (1) and solasodine (2) to a commercially
very important drug intermediate 16-dehydropregnenolone
acetate (16-DPA, 9) was developed with an overall yield of 75%.
This process can easily be exploited for industrial productio
Studies on uracils : synthesis of novel pyrido[2,3-d]- pyrimidine oxides via ring transformation of isoxazolo[3,4-d]pyrimidine
Get PDFThe reaction of isoxazolo[3,4-d]pyrimidine 1 and cyanoolefins 2 in the presence of triethylamine (Et3N) as a catalyst
afforded an unprecedented one-pot synthesis of biologically important pyrido[2,3-d]pyrimidine oxides 3 in excellent yields
